*{
    margin: 0;
    padding: 0;
}

.middle{
      display: flex;
      justify-content: center;
  }
.middle>div>div:nth-child(1){
    display: flex;
    justify-content: center;
    background-color: #CCCCCC;
    width: 1920px;
    height: 400px;
}
.middle>div>div:nth-child(1)>div{
    display: flex;
    justify-content: center;
    background-image: url("../img/about_banner.jpg");
    width: 1500px;
    height: 400px;
}
.middle>div>div:nth-child(2)>div>div:nth-child(1){
    display: flex;
    justify-content: center;
    font-size: 30px;
    margin-top: 50px;
}
.middle>div>div:nth-child(2)>div>div:nth-child(2){
    display: flex;
    justify-content: center;
    color: gray;
    margin-top: 10px;

}